The pulveriser automaton was originally intended as a mining machine.

Its sonic shriek was designed to weaken stone and its wedges to finish the job of breaking it up.

Thanks to is blindsight ability, this construct is particularly effective underground.

A pulveriser looks something like a four-legged, metal lobster with spiked wedges instead of claws.

Instead of a head, it has a round opening at the top of its body from which it emits its sonic attacks.